- Miller-Urey Experiment
- Milstein, César (1927-2002)
- Mitochondria and Cellular Energy
- Mitochondrial DNA
- Mitochondrial Inheritance
- Mold
- Molecular Biology and Molecular Genetics
- Monod, Jacques Lucien (1910-1976)
- Mononucleosis, Infectious
- Montagnier, Luc (1932- )
- Montague, Mary Wortley (1689-1762)
- Moore, Ruth Ella (1903-1994)
- Mumps
- Murchison Meteorite
- Murray, Robert (1919- )
- Mutants: Enhanced Tolerance or Sensitivity to Temperature and pH Ranges
- Mutations
- Mycelium
- Mycobacterial Infections, Atypical
- Mycology
- Mycoplasma Infections
